Question: Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy

Can someone help me to answer this correctly, please, and explain it. Please answer these 2 short questions, I don't have more money to buy more questions. These 2 questions are different.

1. a.

Can someone help me to answer this correctly, please, and explain it.

1. b.

Please answer these 2 short questions, I don't have more money to

How many grams of Ca(NO3)2 are there in 209 grams of an aqueous solution that is 15.6% by weight Ca(NO3)2. gCa(NO3)2 Too much zinc in drinking water can cause the following undesireable effects: metallic taste. The EPA's Secondary Maximum Contaminant Level for zinc in drinking water is 5.00mg/L. (1) If 1.86104 liters of water in a storage tank contains 51.7 grams of Zn, what is the contaminant level in ppm? ppm Assume that the density of the impure water is 1.00g/mL. (2) Is this level acceptable based on EPA guidelines

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